.PHONY: all clean

all:
	cd sandbox; $(MAKE) all
	cd lib; $(MAKE) all
	cd user; $(MAKE) all
	cd kernel; $(MAKE) all

clean:
	cd sandbox; $(MAKE) clean; true
	cd lib; $(MAKE) clean; true
	cd user; $(MAKE) clean; true
	cd kernel; $(MAKE) clean; true
